GhostAI 0.7.4 — website link update

Website: https://ghostai.site
Account and helper setup links now use the new website.
Cloud AI endpoint and Supabase account storage are unchanged.
Billing uses the new site billing endpoint for return links.
The extension identity, permissions, shortcuts and saved settings are unchanged.

Existing unpacked install: replace the extension files IN THE SAME FOLDER, then click Reload in chrome://extensions. Do not uninstall if you want to retain local settings.
Chrome Web Store release: upload the extension-only ZIP as a new version to the existing listing. This package has not been submitted to the store.

This full package is the available development source with Node.js 22+ required. It is not a new signed/bundled desktop installer. Existing installed helpers can continue to be used.
